81486011963 has 4 divisors (see below), whose sum is σ = 82326074040. Its totient is φ = 80645949888.

The previous prime is 81486011933. The next prime is 81486011969. The reversal of 81486011963 is 36911068418.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81486011963 - 2¹⁰ = 81486010939 is a prime.

It is a super-2 number, since 2×81486011963² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81486011969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420030893 + ... + 420031086.

It is an arithmetic number, because the mean of its divisors is an integer number (20581518510).

Almost surely, 2^81486011963 is an apocalyptic number.

81486011963 is a deficient number, since it is larger than the sum of its proper divisors (840062077).

81486011963 is an equidigital number, since it uses as much as digits as its factorization.

81486011963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840062076.

The product of its (nonzero) digits is 248832, while the sum is 47.

The spelling of 81486011963 in words is "eighty-one billion, four hundred eighty-six million, eleven thousand, nine hundred sixty-three".